Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 23

January 7, 200818 counties in Illinois

The Storm Prediction Center issued this mesoscale discussion at Jan 7, 2008, 10:12 PM CST for 18 counties in Illinois. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 7, 2008, 10:12 PM CST (04:12 UTC)
Expired: Jan 8, 2008, 12:15 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Logan County, IL, Macon County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.2 hours before the alert went out and 69 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 655 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 317 m²/s²
0-3 km storm-relative helicity: 343 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 7, 6:11 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Pike, Schuyler	94 min
Jan 7, 6:57 PM CST	Mesoscale Discussion	SPC	Calhoun, Greene, Jersey, Madison, Monroe, Pike and 2 more	93 min
Jan 7, 7:03 PM CST	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 4 more	117 min
Jan 7, 7:48 PM CST	Tornado Watch PDS	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jackson and 12 more	9 hr
Jan 7, 10:04 PM CST	Mesoscale Discussion	SPC	Calhoun	86 min
Jan 8, 11:27 AM CST	Mesoscale Discussion	SPC	Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more	2 hr
Jan 8, 11:40 AM CST	Mesoscale Discussion	SPC	Jo Daviess	5 hr
Jan 8, 12:22 PM CST	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 10 more	83 min
Jan 8, 1:11 PM CST	Mesoscale Discussion	SPC	Gallatin, Hardin, Massac, Pope	2 hr
Jan 8, 1:26 PM CST	Tornado Watch	SPC	Gallatin, Hardin, Massac, Pope	8 hr

Nearby

Mesoscale Discussions in Illinois, 2008 Every mesoscale discussion in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.